L-5-hydroxytryptophan April 12, 2017 L-5-hydroxytryptophan Trade Name Orphan Indication Tetrahydrobiopterin deficiency USA Market Approval USA USA Designation Date 1999-01-20 00:00:00 Sponsor Watson Laboratories, Inc.;311 Bonnie Circle, P.O. Box 1900;Corona, California, 91718
